Disaster prevention training system

Abstract

To provide a disaster prevention training system that enables more effective disaster prevention training compared to conventional systems. [Solution] One aspect of the disaster prevention training system of the present disclosure comprises: an environmental image acquisition unit (camera 201) that acquires environmental images of the training site; a gas image forming unit 205 that forms a gas image of carbon monoxide that flows over time; a display image forming unit 206 that forms a display image by recognizing the gas image added to the environmental image; and a display 202 that displays the display image.

Description

Technical Field

[0001] The present disclosure relates to a disaster prevention training system used for disaster prevention training such as fire training and evacuation training, for example.

Background Art

[0002] Conventionally, as described in Patent Documents 1, 2, etc., as a tool for supporting disaster prevention training, a technique of attaching an HMD (Head Mounted Display) to the head of a training subject and outputting images and sounds of a disaster site from the HMD is known. By doing so, a highly realistic training can be realized.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Non-Patent Documents

[0004] [[ID=X]] [[ID=X]]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Note: There are some tags in the original text that seem to be placeholder tags like which are not clear in their specific meaning and are just preserved as per the instruction. Also, the year in the non - patent document 2 reference seems incorrect in the translation as it's "令和4年" which is 2022 in Gregorian calendar, not 2024 as in the original text's reference. I've adjusted it in the translation. If there are specific requirements regarding these dates, the translation can be further adjusted accordingly.For example, in a fire training system that simulates a fire, images of flames and smoke are displayed around the trainee, and the flames and smoke are shown shrinking in response to the trainee's operation of a simulated fire extinguisher. This allows the trainee to experience how to use a fire extinguisher and to determine whether to continue fighting the fire or give up and evacuate based on the state of the flames and smoke.

[0006] However, there is still room for improvement in these conventional simulated disaster prevention training systems.

[0007] This disclosure provides a disaster prevention training system that enables more effective disaster prevention training compared to conventional methods. [Means for solving the problem]

[0008] One aspect of the disaster prevention training system disclosed herein is: An environmental image acquisition unit that acquires environmental images of the training site, A gas image forming unit that forms a gas image of carbon monoxide flowing over time, A display image forming unit that forms a display image by recognizingly adding the gas image to the environmental image, A display that displays the aforementioned image, It is equipped with. [Effects of the Invention]

[0009] According to this disclosure, by visually adding images of gas (carbon monoxide), which is a leading cause of death in fires, to environmental images, trainees can intuitively grasp the progression of gas spread over time, enabling them to practice when to evacuate. Thus, a disaster prevention training system that allows for more appropriate disaster prevention training compared to conventional systems can be realized. [Brief explanation of the drawing]

[0010] [Figure 1] A diagram showing the breakdown of fatalities in residential fires by stage of the event. [Figure 2] Figure showing the causes of death in building fires [Figure 3] Figure showing the effects of carbon monoxide on the human body [Figure 4] Figure showing an example of the change over time of carbon monoxide concentration [Figure 5] Figure showing the change over time of the probability of being able to evacuate [Figure 6] Figure showing the state of fire extinguishing training using the fire extinguishing training system of the embodiment [Figure 7] Block diagram showing the configuration of the fire extinguishing training system of the embodiment [Figure 8] Figure showing examples of environmental images and flame images [Figure 9] Figure showing examples of environmental images and gas images [Figure 10] Figure showing an example of the actual display image displayed on the display, showing an example in which, in addition to the flame image, a gas image of carbon monoxide is displayed [Figure 11] Figure showing an example of the actual display image displayed on the display, showing an example in which, in addition to the flame image, as gas images, a gas image of carbon monoxide, a gas image of hydrogen cyanide, and a gas image of sulfur oxide are displayed

Embodiments for Carrying Out the Invention

[0011] <1>Findings of the Inventor Who Reached the Invention Before explaining the embodiments of the present invention, the findings of the inventor who reached the present invention will be explained

[0012] Based on many years of experience in fire fighting activities, the inventor of the present invention has earnestly studied conventional fire training systems using simulated fire extinguishers and virtual images, and has come to realize a system that can comprehensively train not only training for extinguishing fires but also how a person extinguishing fires should act at a fire site

[0013] <1-1>Status of Dead Persons by Passage of Time in Residential Fires First, the inventor focused on the distribution of fatalities in residential fires by stage of the event. Figure 1 is a pie chart showing the distribution of fatalities in residential fires by stage of the event. Figure 1 is based on residential fires that occurred in 2021, as published in the 2022 Fire and Disaster Management Agency's Fire and Disaster Management Agency White Paper. Also, arson suicides and similar incidents are excluded from the data in Figure 1.

[0014] The inventor noted that, looking at the sequence of events leading to death in residential fires shown in Figure 1, 48.9% of deaths were due to delayed escape, and of those, 5.1% were due to people who were unable to escape because they were unable to extinguish the fire while trying to put it out. This means that there are times when the transition from firefighting to evacuation is difficult. In addition, among the other 446 deaths, there were cases where initial firefighting efforts failed and the fire department was notified, or where people were unable to evacuate because they were trying to rescue others. Including these cases, the number of deaths due to delayed escape caused by firefighting efforts is about 10%.

[0015] <1-2> Causes of death in building fires The inventor also focused on the causes of death in building fires. Figure 2 shows the causes of death in building fires that occurred in 2021, as published in the 2022 Fire and Disaster Management Agency's Fire and Disaster Management Agency White Paper. From Figure 2, it can be seen that of the 1,165 deaths in building fires, 429 died from carbon monoxide poisoning. Furthermore, it is assumed that this percentage is even higher if those who were unable to escape due to CO are included. In other words, many of those who died from burns had CO-HB levels exceeding 50%, and there are many cases in which people lost consciousness due to toxic gases such as CO and then suffered burns. Even now, death certificates often state death by burns without examining the blood. Therefore, it is thought that there are many people who died from carbon monoxide poisoning among those whose cause of death is listed as burns.

[0016] <1-3> Consideration of evacuation timing Furthermore, the inventor considered the relationship between firefighting activities and appropriate evacuation timing.

[0017] Figure 3 illustrates the effects of carbon monoxide on the human body. The values ​​in Figure 3 are those described in Non-Patent Literature 1. Note that the values ​​in Figure 3 are just examples, and the values ​​for the effects of carbon monoxide on the human body vary depending on the organization, such as the Japan Fire Science Society, the Japan Medical Association, and the Japan Society for Emergency Medicine. According to these sources, a carbon monoxide concentration exceeding approximately 3000 ppm can lead to death in about 30 minutes. However, in fires that spread rapidly, such as past gasoline arson cases, deaths have occurred from people collapsing and dying while trying to evacuate, suggesting that there was little time to spare.

[0018] Figure 4 shows an example of the change in carbon monoxide concentration over time. Figure 4 is described in Non-Patent Literature 2. Specifically, it simulates the carbon monoxide concentration in the waiting room of a clinic that was affected by a gasoline arson fire that occurred on December 17, 2021, at the Dojima Kita Building, 4th floor, 1-3-17 Sonezaki Shinchi, Kita-ku, Osaka City, Osaka Prefecture. Since carbon monoxide concentration generally increases with height from the floor, the carbon monoxide concentrations at heights of 0.3m, 1.0m, and 1.8m from the floor are simulated to represent this.

[0019] The inventors hypothesized that the time available for evacuation would follow the curve K1 in Figure 5, given the effects of carbon monoxide on the human body as shown in Figure 3, the temporal changes in carbon monoxide concentration during a fire as shown in Figure 4, and the simultaneous increases in carbon dioxide, cyanide, sulfur-based gases, and decreases in oxygen. Curve K1 shows the temporal changes in the probability of being able to evacuate. As can be seen from curve K1 in Figure 5, the probability of being able to evacuate decreases sharply around 160 seconds after the fire starts.

[0020] Based on the considerations described above, the inventor concluded that it is extremely important to train not only how to extinguish a fire but also when to evacuate during firefighting training, which led to the present invention.

[0021] One feature of the present invention is that a display image is formed by recognizing and adding images of carbon monoxide and / or toxic gases flowing over time to environmental images of the training site.

[0022] This allows trainees to experience what actions to take in different situations and at different times, significantly reducing the probability of being trapped and dying in an actual fire. As a result, it becomes possible to create a disaster prevention training system that enables more appropriate disaster prevention training compared to conventional methods.

[0023] <2> Embodiment The embodiments of this disclosure will be described in detail below with reference to the drawings.

[0024] Figure 6 shows a fire extinguishing training session using the fire extinguishing training system of the embodiment. The fire extinguishing training system 10 includes a simulated fire extinguisher 100 operated by the trainee 1, an HMD (Head Mounted Display) 200 worn on the trainee 1's head, and a controller 300. The simulated fire extinguisher 100 is shaped to resemble an actual fire extinguisher and includes a cylinder 101, a lever 102, a hose 103, and a safety pin (not shown).

[0025] Figure 7 is a block diagram showing the configuration of the fire extinguishing training system 10 of this embodiment.

[0026] When the lever 102 for spraying the fire extinguishing agent is squeezed by the trainee 1, the simulated fire extinguisher 100 transmits a signal to the HMD 200 wirelessly from the transmitter 104. A gyro sensor (hereinafter abbreviated as "gyro") 105 is also provided near the tip of the hose 103. The gyro 105 detects the orientation of the tip of the hose 103. The detection signal output from the gyro 105 is wirelessly transmitted from the transmitter 104 to the HMD 200.

[0027] The controller 300 has an operation unit 301 and a transmission unit 302. The operation unit 301 is, for example, an operation button or a jog dial, and receives input from the trainee 1. The operation signals output from the operation unit 301 are transmitted wirelessly from the transmission unit 303 to the HMD 200.

[0028] The HMD200 includes a control unit 210, a camera 201, a display 202, a communication unit 203, a smoke / flame image forming unit 204, a gas image forming unit 205, and a display image forming unit 206. The control unit 210 controls the overall operation of the HMD200.

[0029] In this embodiment, the HMD200 performs so-called AR (Augmented Reality) display, which adds various information, such as a virtual smoke and flame image, to the real-world environmental image in front of the trainee 1.

[0030] Camera 201 captures an image of the front of the trainee 1. Display 202 is positioned within the trainee 1's field of view. Communication unit 203 wirelessly receives signals from the transmitter 104 of the simulated fire extinguisher 100 and the transmitter 302 of the controller 300. Communication unit 203 can also wirelessly connect to an external server or the like.

[0031] Here, the flame image forming unit 204, the gas image forming unit 205, and the display image forming unit 206 each include a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc., as their main components. The CPU reads a program corresponding to the processing content from the ROM, loads it into the RAM, and works in cooperation with the loaded program to realize the flame image forming process, gas image forming process, and display image forming process described above. Note that all or part of the flame image forming unit 204, the gas image forming unit 205, and the display image forming unit 206 may be formed using hardwired circuits such as ASICs (Application Specific Integrated Circuits) or FPGAs (Field-Programmable Gate Arrays).

[0032] The smoke and flame image forming unit 204 stores model images of flames and smoke when a fire occurs as basic smoke and flame images. Specifically, the smoke and flame image forming unit 204 stores the way flames and smoke spread over time from the time the fire started as time-series image data. For example, the smoke and flame image forming unit 204 stores the way flames and smoke spread over time as video data.

[0033] The basic smoke and flame images stored in the smoke and flame image forming unit 204 can also be acquired from an external server via the communication unit 203. In this way, the smoke and flame image forming unit 204 can form smoke and flame images of various patterns. For example, the way flames and smoke spread over time differs between wooden buildings and concrete buildings. By acquiring smoke and flame images of various patterns, the smoke and flame image forming unit 204 can simulate various fire patterns.

[0034] Furthermore, the smoke flame image forming unit 204 receives fire extinguisher operation information from the simulated fire extinguisher 100 and the controller 300 via the communication unit 203. Here, the fire extinguisher operation information consists of operation information for the lever 102 and information from the gyro 105 (i.e., information on the direction of the hose 103) from the transmission unit 104.

[0035] The smoke and flame image forming unit 204 forms a smoke and flame image by modifying the basic smoke and flame image based on the fire extinguisher operation information. Specifically, if the lever 102 is not being squeezed, or if the direction of the hose 103 is significantly deviated from the direction of the flame, the smoke and flame image forming unit 204 forms a smoke and flame image in which the flame and smoke spread over time without modifying the basic smoke and flame image.

[0036] On the other hand, when the lever 102 is squeezed and the direction of the hose 103 (i.e., the direction of the extinguishing agent) is directed towards the flame, the smoke and flame image forming unit 204 forms a smoke and flame image consisting of flames and smoke being extinguished by the extinguishing agent.

[0037] In this way, the smoke and flame image forming unit 204 forms a smoke and flame image showing the flame and smoke spreading over time, or a smoke and flame image showing the flame and smoke shrinking over time, based on the orientation of the hose 103 relative to the flame and the size of the flame when the hose 103 is pointed towards it. The speed at which the flame and smoke spread or shrink under different conditions of the relationship between the flame and smoke and the extinguishing agent can be simulated from an actual fire, so the smoke and flame image forming unit 204 forms the smoke and flame image by performing calculations that simulate an actual fire. The smoke and flame image also includes a virtual image of the sprayed extinguishing agent. The virtual image of the extinguishing agent can be formed based on the orientation of the hose 103.

[0038] The gas image forming unit 205 stores a model image of the gas at the time of the fire as a basic gas image. Specifically, the gas image forming unit 205 stores the way the gas spreads over time after the fire starts as time-series image data. For example, the gas image forming unit 205 stores the way the gas spreads over time as video data.

[0039] Here, the gas image forming unit 205 is configured to form gas images with different gas movements and concentrations depending on the type of gas. In this embodiment, the types of gases are carbon monoxide, hydrogen cyanide (HCN), sulfur oxides (SOx), and oxygen. For example, the gas image forming unit 205 stores a model gas image over time based on the data shown in Figure 4 for carbon monoxide. Similarly, it stores model gas images over time for hydrogen cyanide, sulfur oxides, and oxygen, corresponding to each gas. These model gas images over time can be described as images of the change in gas concentration over time according to the height from the floor, corresponding to each type of gas.

[0040] The model gas images stored in the gas image forming unit 205 over time can also be acquired from an external server via the communication unit 203. In this way, the gas image forming unit 205 can form gas images of various patterns. For example, the gases generated and their concentrations differ between wooden buildings and concrete buildings. By acquiring model gas images of various patterns, the gas image forming unit 205 can simulate gas images of various patterns.

[0041] In addition, the gas image forming unit 205 receives the smoke and flame image formed by the smoke and flame image forming unit 204 and changes the model gas image based on the smoke and flame image. In other words, since the actual gas concentration is affected by the state of the flame and smoke, the gas image forming unit 205 changes (or corrects) the model gas image based on the smoke and flame image, which is the result of the firefighting activity.

[0042] Furthermore, instead of changing (correcting) the model gas image based on the smoke and flame image from the smoke and flame image forming unit 204, the gas image forming unit 205 may change (correct) the model gas image based on the operation information of the trainee from the simulated fire extinguisher 100. In other words, the gas generation situation depends on the firefighting activity of the trainee, and in this embodiment, the gas generation was controlled according to the state of flames and smoke, which are the result of the firefighting activity, but the gas generation may be directly controlled by the information of the firefighting activity.

[0043] The display image forming unit 206 combines the captured image obtained by the camera 201, the smoke and flame image formed by the smoke and flame image forming unit 204, and the gas image formed by the gas image forming unit 205.

[0044] At this time, the display image forming unit 206 assigns a color to the gas image that is visible to the trainee 1. For example, although carbon monoxide is actually nearly colorless, it is assigned a color such as yellow so that the trainee 1 can see it. Furthermore, if the gas image contains multiple types of gases, the display image forming unit 206 assigns a different color to each type of gas.

[0045] As a result, smoke and flame images and gas images are superimposed on the environmental image in front of trainee 1 (image captured by camera 201), creating a smoke and flame image that makes it appear as if a fire is occurring in front of trainee 1, as well as a gas image. The simulated image consisting of the smoke and flame image and gas image obtained by the display image forming unit 206 is output to the display 202 and displayed together with the environmental image.

[0046] Figure 8 shows an example of an environmental image and a smoke / flame image (flame image F1 and smoke image F2) F0. Figure 9 shows an example of an environmental image and a gas image G0. In the example in Figure 9, gas image G0 displays two types of gas images: a carbon monoxide gas image G1 and a hydrogen cyanide gas image G2. Note that, due to the drawing format, the carbon monoxide gas image G1 and the hydrogen cyanide gas image G2 are completely separate in the figure, but in the actual displayed image, these images overlap to some extent. That is, the carbon monoxide gas image G1 is displayed up to the ceiling. Also, although the density of the gas is not shown in the figure, in the actual displayed image, the higher the concentration of the gas, the darker the color it is displayed. That is, gas images G1 and G2 are displayed in darker colors as they get closer to the ceiling.

[0047] Figures 10 and 11 show examples of actual display images shown on the HMD200's display 202. In the example in Figure 10, in addition to the smoke and flame image F0, the carbon monoxide gas image G1 is displayed. In the example in Figure 11, in addition to the smoke and flame image F0, the gas images G0 include the carbon monoxide gas image G1, the hydrogen cyanide gas image G2, and the sulfur oxide gas image G3. As mentioned above, gas images G1, G2, and G3 are displayed partially overlapping each other. Also, although the figures do not show the density of the gases, in the actual display images, the higher the concentration of the gas, the darker the color. In other words, each of the gas images G1, G2, and G3 is displayed in a darker color the closer they are to the ceiling.

[0048] <3> summary As explained above, the disaster prevention training system of this disclosure may have the following configuration, for example.

[0049] (1) One aspect of the disaster prevention training system of the present disclosure comprises an environmental image acquisition unit (camera 201) that acquires environmental images of the training site, a gas image forming unit 205 that forms a gas image of carbon monoxide that flows over time, a display image forming unit 206 that forms a display image by recognizing the gas image added to the environmental image, and a display 202 that displays the display image.

[0050] This system allows for the visible addition of gas images (carbon monoxide), which are a leading cause of death in fires, to environmental images. This enables trainees to intuitively grasp the progression of gas spread over time, allowing for training on when to evacuate. Thus, a disaster prevention training system that enables more appropriate disaster prevention training compared to conventional systems can be realized.

[0051] (2) In one aspect of the disaster prevention training system of the present disclosure, in (1) above, the gas image forming unit 205 forms multiple types of gas images, and the display image forming unit 206 assigns different colors to the multiple types of gas images according to the type of gas.

[0052] This will allow trainees to understand the extent to which each of multiple gases, with their different flow conditions over time, is spreading.

[0053] (3) One aspect of the disaster prevention training system of the Disclosure herein is that, in (2) above, the multiple types of gas images include, in addition to the carbon monoxide gas image, at least one of the hydrogen cyanide and sulfur oxide gas images.

[0054] (4) In one aspect of the disaster prevention training system of the present disclosure, in any of (1) to (3) above, the gas image forming unit 205 (or display image forming unit 206) adds a gradient to the gas image according to the gas concentration.

[0055] (5) One aspect of the disaster prevention training system of the present disclosure further comprises a smoke and flame image forming unit 204 that forms a smoke and flame image in (1) above, and a display image forming unit 206 that forms a display image by adding a smoke and flame image to an environmental image in addition to a gas image.

[0056] This allows trainees to see both smoke and flame images and gas images, and to personally confirm the relationship between the two—that is, what state the gas is in when the smoke and flames are in a given state. As a result, they can be trained to determine when to stop firefighting efforts and evacuate.

[0057] (6) One aspect of the disaster prevention training system of the present disclosure further includes an operation reception unit (simulated fire extinguisher 100) that receives fire extinguisher operation information from the trainee, and the display image forming unit 206 changes both the gas image and the smoke flame image based on the fire extinguisher operation information.

[0058] (7) In one aspect of the disaster prevention training system of the present disclosure, in (6) above, the display image forming unit 206 adds an image of a fire extinguishing agent based on fire extinguisher operation information to the display image.

[0059] (8) One embodiment of the disaster prevention training system of the present disclosure further comprises, in (1) above, an operation reception unit (simulated fire extinguisher 100) that receives fire extinguisher operation information from the trainee, and a gas image forming unit 205 stores a model gas image of carbon monoxide flowing over time, and based on the fire extinguisher operation information, changes the model gas image to form a gas image to be displayed on the display 202.

[0060] The embodiments described above are merely examples of how the present invention can be implemented, and the technical scope of the present invention should not be interpreted as being limited by them. In other words, the present invention can be implemented in various forms without departing from its gist or its main features.

[0061] In the above-described embodiment, the case using a head-mounted display (HMD) 200 was mentioned, but instead of the head-mounted display 200, it may be used in a glasses-type device. In other words, the control unit 210, camera 201, display 202, communication unit 203, smoke flame image forming unit 204, gas image forming unit 205, and display image forming unit 206 may be mounted in a glasses-type device.

[0062] Alternatively, the control unit 210, communication unit 203, smoke flame image forming unit 204, gas image forming unit 205, and display image forming unit 206, etc., may be provided in an information processing device such as a personal computer, while the camera 201 and display 202 may be provided in a head-mounted display or glasses-type device attached to the training subject, and the operation of the embodiment may be realized by wireless communication between the information processing device and the head-mounted display or glasses-type device.

[0063] The above-described embodiment illustrates the application of this disclosure to a system that displays AR images. However, this disclosure is not limited to this and can also be applied to systems that display images such as VR (Virtual Reality), MR (Mixed Reality), and SR (Substitutional Reality). For example, when applied to a system that displays MR images, an environment image forming unit that forms a virtual environment image can be provided instead of the camera 201 in Figure 7. The environment image forming unit then changes the environment image according to the head and eye movements of the training subject 1. In this way, the display image forming unit 206 can obtain a VR image by combining a virtual environment image with a virtual smoke or gas image.

[0064] In the above-described embodiment, we discussed a case where a smoke and flame image is added to the environmental image along with the gas image. However, a form in which the smoke and flame image is not displayed can also be adopted. In this case, the trainees will be able to intuitively grasp the rate of gas image spread over time, and training can be conducted on when they should evacuate, etc.

[0065] In other words, although the above-described embodiment described the case in which the disaster prevention training system of this disclosure is embodied as a fire extinguishing training system 10, the disaster prevention training system of this disclosure can be used not only for fire extinguishing training but also for evacuation training from environments in which dangerous gases are generated. [Industrial applicability]

[0066] The disaster prevention training system disclosed herein is useful as a disaster prevention training system used for disaster prevention drills such as fire drills and evacuation drills. [Explanation of Symbols]

[0067] 1. Participants in training 10. Firefighting training system 100 Simulated fire extinguisher 101 Cylinder 102 Lever 103 Hose 104, 302 Transmitter 105 Gyro 200 Head-Mounted Displays (HMDs) 201 Camera 202 displays 203 Communications Department 204 Smoke flame image forming section 205 Gas image forming unit 206 Display image forming section 210 Control Unit 300 controllers 301 Operation section

Claims

1. An environmental image acquisition unit that acquires environmental images of the training site, A gas image forming unit that forms a gas image of carbon monoxide flowing over time, A display image forming unit that forms a display image by recognizingly adding the gas image to the environmental image, A display that displays the aforementioned image, Equipped with, The gas image added by the display image forming unit is an image showing the carbon monoxide gas concentration which changes over time according to the height from the floor, and the higher the gas concentration, the darker the color displayed. Disaster prevention training system.

2. The gas image forming unit forms multiple types of gas images. The display image forming unit assigns different colors to the multiple types of gas images according to the type of gas. The disaster prevention training system according to claim 1.

3. The aforementioned multiple types of gas images include, in addition to the carbon monoxide gas image, at least one of either hydrogen cyanide or sulfur oxide gas images. The disaster prevention training system according to claim 2.

4. It further comprises a smoke flame image forming unit that forms a smoke flame image, The display image forming unit forms the display image by adding the smoke and flame image to the environmental image in addition to the gas image. The disaster prevention training system according to claim 1.

5. Furthermore, it is equipped with an operation reception unit that receives information on fire extinguisher operation by trainees, The display image forming unit changes both the gas image and the smoke flame image based on the fire extinguisher operation information. The disaster prevention training system according to claim 4.

6. The display image forming unit adds an image of the fire extinguishing agent based on the fire extinguisher operation information to the display image. The disaster prevention training system according to claim 5.

7. Furthermore, it is equipped with an operation reception unit that receives information on fire extinguisher operation by trainees, The gas image forming unit stores a model gas image of carbon monoxide flowing over time, and based on the fire extinguisher operation information, it changes the model gas image to form a gas image to be displayed on the display. The disaster prevention training system according to claim 1.

Images